Tire relief valve



Aus- 8, 1950 y E. PAYNE 2,517,917

TIRE RELIEF VALVE Filed July 29, 1946 j l.. BY

Patented ug. 8, 1,950

" STAT ESPATENT oEFlCE TIRE RELIEF VALVE4 Ernest' Payne, Denven C'olo.

Application .I uly.A 29,y 1946, SerialNo. 686,874`

'quickly-and easily .installed in place of the conventional valve insides without requiring any change in the conventional. valve.

Anotherv object of the invention is to so constircttthedevice' that'itmay be installed with the usual valve cap as the only tool, and so that sudden andi? temporary. risesin pressure, such as occasioned by uneven road conditions, collisions, etc., will not cause loss of air, from` the tire.

vThe improved regulating valve is designed more particularly as an improvement over the valve described and illustrated in applicants copending application, Serial No. 638,033.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a highly magnified vertical section through a conventional pneumatic tire valve stem with the improved pressure relief valve in place therein; and

Figs. 2, 3, and 4 are cross sections therethrough taken on the lines 2 2, 3 3, and 4 4, respectively, Fig. 1.

In the drawing a conventional tire Valve stem is indicated at I0, with a covering cap II. The cap II may be of the conventional design and lprovided with a socket-like wrench I2 for unscrewing the valve insides from the stem.

The conventional tire valve stem is provided with internal threads I3 for receiving the valve insides, and with external threads I4 for receiving the cap II. The internal diameter of the upper portion of the stem I is larger than the internal diameter ofthe lower portion thereof, the two diameters being connected by a tapered portion I5.

This,

` 1 claim.vv (o1. iev-469,5);l

The improved .relief valve y consists'v of. a plug; IISL having a sealing gasket; ISL-designed to-seat against; the tapered portion I ."iA and provided vwith external threads IBengaging the threads I3.; l The plug is;

, formed witht an axial spring chamber opening;

through itstopand with a. circular valve seat' ZI on` its bottom. The, plug., is provided with the; usualVVV bosses 34 for engagement by the wrench; I2.of the cap I,-I;

lit: A valve stem 22 extends throughout theflength of the` plug i6, andprcjects above and below ythe latter.` terminatingY at its bottom in a terminal, nut 23. The upper portion of the stern is fiat-r tened to provide a spring retaining seat I9.

l'l yAn inverted, cup-shaped valve disc 24 is per` 2Q; seat 26 on its interior.

manently formed onV or secured to the stemv 22 below the valve' seat 2I. A tubular-Valve cage 25v surrcund's'the disc 2d; The cage'is provided" with an'upwardly extending annular relief valvev gasket .21 is tted into the disc 24 and.l extends into, the seat at. its bottom, there beinga shoule der 2.8: provided for sealing-the seat 26.v

A check valve gasketl 3.0 is mounted in areeeiv ing ring fixed in the top of the cage 25 and seats against the valve seat 2l. A restraining gasket 3I is mounted on top of the disc 24 and seats against the bottom of the receiving ring.

The cage 25 is constantly urged upwardly by means of a relief valve spring 32 which is compressed between the bottom of the cage 25 and the terminal nut 23. This upward action maintains the seat 26 against the shoulder 28 of the relief valve gasket 21.

The valve stem 22 is constantly urged upwardly in the plug I6 by means of a check valve spring 33, the upper extremity of which acts against the spring retaining seat I9 on the stem 22, and the lower extremity of which acts against vthe bottom of the spring chamber 20 of the plug I6. The action of the spring 33 is to force the check valve gasket 30 against the seat 2|.

The t between the lower Iportion of the relief valve gasket 2l and the interior of the valve seat 26 is not air tight, so that the former may slide easily within the latter and so that air may slowly leak from the tire when the shoulder 28 is away from the seat 26.

Operation l22 through the spring chamber 20 against the check valve gasket 30, forcing the latter downwardly against the action of the spring 33, thence A steppedk relief valve' will flow around the cage 25 into the tire. When the incoming air ceases, the spring 33 will pull the gasket 30 against the seat 2l, sealing the Valve.

Should the pressure in the tire be in excess of a pre-determined pressure, it will act against the gasket 21 to lift the shoulder 28 from the valve seat 26. Due to the fact that the gasket 21 ex-v tends Within the valve seat 26, it does not completely open, however, but causes a slow leak at this point, allowing the air to slowly escape upwardly around the stem 22 until the excess pressure is relieved suiciently to allow the relief valve spring 32 to again bring the shoulder 28 into sealing contact with the valve seat 26.

Should the pressure in the tire suddenly rise, for instance, due to the tire striking an obstruction, this sudden rise in pressure will force the gasket 21 upwardly until the restraining gasket 3l seals the outlet from the cage 25 around the stem 22, preventing the escape of air until normal conditions are restored in the tire.

For the convenience of description the location of the various parts of the improved relief valve have been referred to in the specification and claims by the directions up and down. It is to be understood that these directions refer tothe position of the valve on the drawing, since in use the valve will assume infinite angular positions.

The cap I I is provided with a bleed opening 31 extending through the cap and through a conventional gasket contained therein. The bleed I without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent is:

A combined relief and check valve for pneumatic tire valve stems comprising: a plug adapted to be inserted in said stem; a spring chamber formed in said plug and opening through the top thereof; a valve stem passage opening through the bottom of said plug from said spring chamber; a spring seating shoulder between said passage and said chamber; a valve stem extending through said plug and projecting from the top and bottom thereof; a spring-engaging projection formed on said stem above said plug; a check valve spring positioned in said spring chamber on said shoulder, said spring surrounding said valve stem and engaging said projection to resiliently support said valve stem; a terminal nut on the lower extremity of said valve stem; a second spring resting Aon said nut; a valve cage supported by said second spring about said valve stem; a gasket on the top of said cage engaging and sealing said plug; a valve disc secured about said stem within said cage; a relief valve seat in the bottom of said cage; a relief valve gasket .positioned between said disc and said seat and adapted to close said seat; and a stop gasket positioned between said disc and the top o said cage, said relief valve gasket having a portion extending into and partially sealing said seat.

ERNEST PAYNE.

REFERENCES CITED Thefollowing references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,172,477 Mizener Feb. 22, 1916 1,250,503 Ray Dec. 18, 1917 1,854,784 Crowley Apr. 19, 1932 2,124,844 Boroughs July 26, 1938 2,246,775 Anderson June 24, 1941 

